"Free Splunk" is NOT the same as the "60-day-trial-Splunk Enterprise".
The former allows you to use Splunk in your environment, ingesting 500MB/day but leaving out many (if not all) of the features you for sure want in an enterprise environment, e.g. authentication or clustering. But still you have the main professional functionality like indexing, searching, reports, dashboards etc. with all their benefits.
The latter is the complete Splunk Enterprise solution with no reduction in functionality - but for a 60-day-trial period. In my opinion it would be unreasonable from a Splunk Inc.'s perspective to "give it away for free" 😉
Have a look to see the differences between the Splunk versions.
You can still change your trial-installation to the free version:
Just go to "Settings - LIcensing - Change License Group" and select "Free Splunk". But be aware that there's no authentication any longer. So if your Splunk installation is directly connected to the internet, everyone could analyse your data...
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